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. 1970 Aug;39(4):809–816. doi: 10.1111/j.1476-5381.1970.tb09907.x

Effects of (±)-propranolol, (±)-, (+)-, and (-)-alprenolol on unanaesthetized dogs with ventricular arrhythmias resulting from coronary artery ligation

B R Duce, L Garberg, E R Smith
PMCID: PMC1702731  PMID: 4394971

Abstract

1. The effects of (±)-propranolol, (±)-, (+)- and (-)-alprenolol were studied in unanaesthetized dogs with ventricular arrhythmias produced by ligation of the left coronary artery. The responses were compared with those of similar control dogs which were given only isotonic saline.

2. The ventricular arrhythmias were abolished by cumulative doses of 3·5 mg/kg of (±)-alprenolol, 7·5 mg/kg of (-)-alprenolol and (±)-propranolol and by 15·5 mg/kg of (+)-alprenolol.

3. At the time of maximum antiarrhythmic activity none of the drugs produced significant alterations in mean arterial pressure or atrial rate.

4. Cumulative doses of 7·5 mg/kg and 15·5 mg/kg of the four drugs resulted in some instances of lip licking, emesis and/or head tremors while 31·5 mg/kg was invariably lethal.

5. Since the β-adrenoceptor blocking activity of (-)-alprenolol is 100 times greater than that of (+)-alprenolol, suppression of these ventricular arrhythmias was apparently unrelated to antagonism of sympathetic influences.

6. Alprenolol and propranolol have myocardial depressant properties apart from their effects on β-adrenoceptors which could account for the anti-arrhythmic activity observed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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